Search found 22 matches

by pebe
Wed Nov 28, 2007 11:43 am
Forum: General Discussion
Topic: Cold Heat Soldering Iron, the Verdict is in...
Replies: 24
Views: 5119

A similar device was used by a TV Cable company almost 50yrs ago to solder 0.104" cored coax cable. The cabling jointing was done at eaves level using a battery pack for portability. The 'soldering iron' was a carbon bit connected to one side of a 6V lead-acid accumulator, while a lead from the othe...
by pebe
Sun Nov 18, 2007 1:03 pm
Forum: General Discussion
Topic: Rare earth magnets are sold as a fix or cure for everything!
Replies: 11
Views: 2104

I can vouch for the water softener. I once lived in a very hard water area where it was necessary to descale the kettle once a week because of limescale buildup. I bought one of these devices - Swedish made - after reading good reports of it. Sure enough it worked. But not by softening the water in ...
by pebe
Sun Oct 28, 2007 4:33 pm
Forum: General Discussion
Topic: Water Boil Detector
Replies: 55
Views: 9580

We have a Panasonic microwave oven that automatically cooks vegetables. You put any quantity of vegetables in a container and switch on. A humidity sensor acts when the temp is up to boiling point by measuring the water vapour given off. The program then calculates from the elapsed time how much lon...
by pebe
Thu Sep 20, 2007 12:58 am
Forum: General Discussion
Topic: Anyone else here charge/test batteries quite often?
Replies: 12
Views: 2704

THis link is the next best to an encyclopedia on the subject.

http://www.batteryuniversity.com/parttwo-33.htm
by pebe
Wed Nov 15, 2006 3:15 pm
Forum: General Discussion
Topic: 555 timer headaches!
Replies: 31
Views: 5978

I think you have a faulty 555. When pin 6 reaches 2/3 of V+, an internal bistable flips over and switches on the discharge transistor whose open collector is connected to pin 7. With pins 6 and 7 joined, this should discharge the cap connected to pin 6. When pin 2 triggers, the bistable flips back m...
by pebe
Sat Jul 15, 2006 10:32 pm
Forum: General Discussion
Topic: another capacitor question???
Replies: 50
Views: 10502

What are you,...ten?
No, sonny. Lucid and literate - and old enough to be your grandfather!

Glad I'm not though - I would hate to have been responsible for begetting a genetic line of stupidity.
by pebe
Sat Jul 15, 2006 12:22 am
Forum: General Discussion
Topic: another capacitor question???
Replies: 50
Views: 10502

Stupidity is my favorite past time.......
It appears to be your life
So has any one figured out yet the relationship between a capacitor and timing yet, Or is the easy way out still
There is no relationship, per se. Capacity is measured in Farads - time in seconds.
by pebe
Wed Jul 12, 2006 12:08 pm
Forum: General Discussion
Topic: another capacitor question???
Replies: 50
Views: 10502

Alzheimer's disease is truly debilitating.
by pebe
Sat Mar 11, 2006 2:57 pm
Forum: General Discussion
Topic: What temp?
Replies: 6
Views: 1107

Re: What temp?

Originally posted by Dean Huster: The best iron I've ever used is a tiny, 15-watt, non-temperature-controlled Antex (made in the UK) iron. Gets hotternell idling, but there isn't hardly any joint short of ground planes that you can't use it on. Seems to me the last one I saw in a catalog was $50 or...
by pebe
Tue Dec 13, 2005 3:22 am
Forum: General Discussion
Topic: deciBel miliWatt...
Replies: 7
Views: 1356

Re: deciBel miliWatt...

Hi Miguel, "..If a source generating 0.775 V of audio has 600ohms source impedance, and is terminated or loaded with 600ohms, there will be 0.775V across the load and is called 0dBu, and ALSO 0dBm.." Not so. I am not familiar enough with dBu to know whether an unloaded voltage is implied, but as far...
by pebe
Mon Dec 12, 2005 2:57 pm
Forum: General Discussion
Topic: deciBel miliWatt...
Replies: 7
Views: 1356

Re: deciBel miliWatt...

Strictly speaking, the dB is the unit of measurement of Power ratios, (the Neper is a similar unit for voltage or current ratios). Modern practice has allowed a suffix, ie 'm' or 'W' to indicate absolute power levels. So 0dBm is a power level of 775mV across 600 ohms. The source impedance is irrevel...
by pebe
Sun Oct 30, 2005 5:13 am
Forum: General Discussion
Topic: Frequency to voltage conversion...
Replies: 8
Views: 1449

Re: Frequency to voltage conversion...

You could use an XOR or XNOR gate. Feed the waveform direct to one input and via an RC network to the other. You get a fixed width pulse out every time the waveform changes polarity. Then integrate the pulses and measure their mean level.
by pebe
Thu Sep 29, 2005 3:55 pm
Forum: General Discussion
Topic: Go stand in the corner, Chris
Replies: 74
Views: 13086

Re: Go stand in the corner, Chris

Why, when I read this thread, am I reminded of my pet puppy that yapps all day for no reason at all?
by pebe
Thu Aug 04, 2005 1:21 am
Forum: General Discussion
Topic: three phase transformer
Replies: 8
Views: 1672

Re: three phase transformer

Thanks Steven. It makes sense now.